ssb: Fix usage of struct device used for DMAing

This fixes DMA on architectures where DMA is nontrivial, like PPC64.
We must use the host-device's (PCI) struct device for any DMA
operation instead of the SSB device. For this we add a new
struct device pointer to the SSB device structure that will always
point to the right device for DMAing.

Without this patch b43 and b44 drivers won't work on complex-DMA
architectures, that for example need dev->archdata for DMA operations.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/ssb/main.c b/drivers/ssb/main.c
index 72017bf2e577..8003a9e55ac4 100644
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -436,15 +436,18 @@ static int ssb_devices_register(struct ssb_bus *bus)
 #ifdef CONFIG_SSB_PCIHOST
                         sdev->irq = bus->host_pci->irq;
                         dev->parent = &bus->host_pci->dev;
+                        sdev->dma_dev = &bus->host_pci->dev;
 #endif
                         break;
                 case SSB_BUSTYPE_PCMCIA:
 #ifdef CONFIG_SSB_PCMCIAHOST
                         sdev->irq = bus->host_pcmcia->irq.AssignedIRQ;
                         dev->parent = &bus->host_pcmcia->dev;
+                        sdev->dma_dev = &bus->host_pcmcia->dev;
 #endif
                         break;
                 case SSB_BUSTYPE_SSB:
+                        sdev->dma_dev = dev;
                         break;
                 }
 
@@ -1018,15 +1021,14 @@ EXPORT_SYMBOL(ssb_dma_translation);
 
 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
 {
-        struct device *dev = ssb_dev->dev;
+        struct device *dma_dev = ssb_dev->dma_dev;
 
 #ifdef CONFIG_SSB_PCIHOST
-        if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI &&
-            !dma_supported(dev, mask))
-                return -EIO;
+        if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI)
+                return dma_set_mask(dma_dev, mask);
 #endif
-        dev->coherent_dma_mask = mask;
-        dev->dma_mask = &dev->coherent_dma_mask;
+        dma_dev->coherent_dma_mask = mask;
+        dma_dev->dma_mask = &dma_dev->coherent_dma_mask;
 
         return 0;
 }